长年累月 chángniánlěiyuè year in year out Definitions Defs Origin Strokes Stroke Words Sentences Sents 长年 長年 chángnián long-term For many years; over a long period累 lěi verbnoun to accumulate (bound form) to pile up; to accumulate; to build up月 yuè noun month month; a time unit based on the cycle of the moon, twelve of which make a year; also used for monthly occurrences or payments